Triple chip ground carbide tip bandsaw blade with ductile filler

• US 4,784,033 A
• Filed: 10/27/1986
• Issued: 11/15/1988
• Est. Priority Date: 01/22/1986
• Status: Expired due to Term

• Current Assignee: Sandvik Milford Corporation
• Original Assignee: Milford Products Corporation
• Inventors: Hayden, Robert C., Wanat, Michael P.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/923,424
• Time in Patent Office: 750 Days
• Field of Search: 83/835, 83/661, 76/101 A, 76/112, 407/119
• US Class Current: 83/661
• CPC Class Codes: B23D 61/121 Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
• CPC Class Codes: B23D 61/14 with inserted saw teeth , i.e. the teeth being individually inserted
• CPC Class Codes: B23D 65/00 Making tools for sawing machines or sawing devices for use in cutting any kind of material
• CPC Class Codes: B23K 31/025 Connecting cutting edges or the like to tools; Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware
• CPC Class Codes: Y10T 407/27 comprising tool of specific chemical composition
• CPC Class Codes: Y10T 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A bandsaw blade including a continuous loop of hardened tempered bandsaw steel having carbide-tipped teeth arranged in pairs, each pair including a "high" tooth and a "low" tooth shaped to provide triple-chip cutting action and ground to provide radial and tangential relief angles on side surfaces of each saw tooth to reduce blade vibration during cutting. The teeth are secured to the blade body by brazing with a solder which includes a discrete layer of a ductile metal which absorbs forces induced in the brazing zone under dynamic load conditions.

Claims

1. In a bandsaw blade for high speed, heavy duty cutting of a workpiece, the combination comprising:

a blade body of a continuous loop of hardened and tempered metal having a plurality of cutting tooth support means defined along the peripheral edge thereof and separated by gullet means;

a plurality of carbide cutting teeth mounted on said blade body in the tooth support means thereof and arranged in pairs;

each pair of said cutting teeth including a leading high tooth and a trailing low tooth constructed and arranged to effect a triple-chip cutting operation on the workpiece; and

,

solder means for securing said cutting teeth to said cutting tooth support means, said solder means including ductile means therein for absorbing the stress forces induced in the tooth support means under dynamic load conditions.

2. A bandsaw blade according to claim 1, wherein said solder means is comprised of first and second layers of a solder alloy with said ductile means being a discrete layer sandwiched therebetween.

3. A bandsaw blade according to claim 2, wherein said ductile means is a metal selected from the group consisting of copper, tin and bronze.

4. A bandsaw blade according to claim 3, wherein said solder alloy comprises a mixture of copper, cadium, zinc and silver.

5. A bandsaw blade according to claim 2, wherein the thickness of said solder means is in the order of 0.007 inches.

6. A bandsaw blade according to claim 5, wherein the width of said solder means is in the order of 0.100 inches.

7. A bandsaw blade according to claim 1, wherein each of said tooth support means comprises a shoulder defined in said blade body rearward of its associated gullet means and a surface extending normal to said shoulder and defining a generally L-shaped mounting surface for supporting each of said cutting teeth, with each of said cutting teeth having a bottom surface supported on said shoulder and a rearward surface extending along said normal surface and said solder means interposed between said mounting surface and said rear and bottom surfaces of said tooth to secure the same to said tooth support means.

8. A bandsaw blade according to claim 7, wherein each of said teeth further includes a top surface, a front surface and first and second side surfaces, said top surfaces of said high and low teeth being inclined rearwardly from the corresponding front surface relative to the longitudinal axis of the blade body defining a clearance angle in the range of between about five degrees and nineteen degrees.

9. A bandsaw blade according to claim 8, wherein said front surfaces of said high and low cutting teeth are positively raked at an angle in the range of between about zero degrees to ten degrees.

10. A bandsaw blade according to claim 7, wherein each of said teeth further includes a top surface, a front surface and first and second side surfaces, said first and second side surfaces being inclined radially of the longitudinal axis of said blade body by an angle in the range of between about one degree to six degrees providing radial relief for an inner portion of said cutting tooth relative to the work piece and said first and second side surfaces of said teeth further being inclined tangentially of the longitudinal axis of said blade body by an angle in the range of between about two degrees to seven degrees providing tangential relief for said inner position of said cutting tooth relative to the work piece.

14. A bandsaw blade according to claim 6, wherein the face angle for said teeth is in the range of between about ten degrees to nine degrees.

15. A bandsaw blade according to claim 14, wherein the face angle is five degrees.

11. In a bandsaw blade for high speed, heavy duty cutting of a workpiece, the combination comprising:

a blade body of a continuous loop of hardened and tempered metal, having a plurality of cutting tooth support means defined along the peripheral edge thereof and separated by gullet means;

a plurality of carbide cutting teeth mounted on said blade body in the tooth support means thereof and arranged in pairs to effect a triple-chip cutting operation on a workpiece; and

,

solder means for securing said cutting teeth to said tooth support means;

each pair of cutting teeth including a leading high tooth and a trailing low tooth shorter than said high tooth, each tooth including a top surface, a front surface and first and second side surfaces,

said top surfaces of said high and low teeth being inclined rearwardly from corresponding front surfaces, relative to the longitudinal axis of said blade body defining a clearance angle for said high and low teeth,

said front surfaces of said high and low teeth being positively raked, defining a face angle for said high and low teeth,

said first and second side surfaces of said high and low teeth being inclined radially and tangentially of the longitudinal axis of said blade body, defining radial and tangential relief angles for said high and low teeth, and corner portions of said leading high tooth being cut away to expose corner cutting edges of the following low teeth to the workpiece, and said solder means including a ductile metal means therein for absorbing stress forces induced in the tooth support means under dynamic load conditions.

12. A bandsaw blade according to claim 11, wherein the clearance angle for said teeth is in the range of between about five degrees to nineteen degrees.

13. A bandsaw blade according to claim 12, wherein the clearance angle is fifteen degrees.

16. A bandsaw blade according to claim 11, wherein the radial relief angle for said teeth is in the range of between about one degree to six degrees.

17. A bandsaw blade according to claim 11, wherein the radial relief angle is three degrees.

18. A bandsaw blade according to claim 11, wherein the tangential relief angle for said teeth is in the range of between about two degrees to seven degrees.

19. A bandsaw blade according to claim 18, wherein the tangential relief angle is four degrees.

20. A bandsaw blade according to claim 11, wherein said corner portions of said leading high teeth are ground away at a corner angle in the range of between about thirty-nine degrees to fifty-two degrees relative to the longitudinal axis of said blade body.

21. A bandsaw blade according to claim 20, wherein the corner angle is forty-five degrees.

22. A bandsaw blade according to claim 11, wherein the spacing between teeth is in the range of between about 0.33 inches to two inches.

23. A bandsaw blade according to claim 11, wherein said solder means includes first and second layers of a solder alloy with said ductile metal means being a discrete layer sandwiched therebetween.

24. A bandsaw blade according to claim 23, wherein said solder alloy comprises a mixture of silver, cadium, zinc and copper and said ductile metal means is copper.